Stop motion for box looms



June 24, 1930. v. H. JENNINGS STOP MOTION FOR BOX LOOMS 3 Sheets-Sheet; l

Filed July 19, 1928 MN MN R June 24, 1930. v. H. JENNINGS STOP MOTION FOR BOX LOOKS 4 j 3 Sheets-Sheet 2 Filed July 19, 1928 VS NQ $1 5 MN QN & Illl I firm/2Z0) I f Urfar (WW/793 w wrs June 24, 1930, v. H. JENNINGS 'STOP MOTION FOR BOX LOOMS Filed July 19, 1928 Y s Sheets-Sheet s Patented June 24, 1930 UNITED] STATES PATENT OFFICE VICTOR H. JENNINGS, 0F WORCESTER, MASSACHUSETTS, ASSIGNOR TO GROMPTON & KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS Application filed July 19,

. This invention relates to improvements in looms which are stopped prior to complete exhaustion of weft in the active shuttle and 1t is the general object of the invention to provide means for stopping the loom with the shuttle in a predetermined position, such for instance as on the plain end of a box loom, so that hand renewal of the Weft may be, effected irrespective of the position of the boxes at the opposite end of the. lay.

Many looms operate with two shuttles which are called into-action in such an order that one shuttle lays twosuccessive picks, the other shuttle lays the; next two successive picks, the first shuttle again becomes active to lay another pair of picks etc. Such a loom will have at leasttwo shifting shuttleboxes at one end of the lay'and ordinarily a plain box at the other end of the lay and may be used either for mixing filling or for the production of fabrics which depend for their character upon differing characteristics of the filling.

' lVhere it is desired to stop the loom prior to complete exhaustion of weft a weft detectormay be used located at the plain end of the loom, the detector to set into motion a train of mechanism effective to stop the loom when the shuttle is properly boxed. In order to facilitate. removal of a shuttle from its box for hand replenishment it is desirable that the shed be substantially closed, but this conitiate stopping by a weft detector at substantial, weft exhaustion but dependent upon referred to there will i be a periodic .shifting of the boxes, usually every other pick, and it is a further object of my invention to provide a mechanism to insror mo'rron non iaox Looms 1928. Serial No,'293,886.

shifting of the boxes to complete the stopping of the loom. In this way I make use of the two pickinterval between successive shiftings of the boxes to cause the delay of a plural ty of pairs of picks which lapse between operation of the detector and ultimate stopping of the loom.

Another object of the invention relates to' p a loom operating on this principle, ascertain features of my invention are usable on a drop box loom wherein more than two successive picksmay be laid by the same shuttle. This is-due to the fact that the mechanism shown herein does not depend essentially upon the number of flights of the shuttle, but does depend upon a shifting of the shutle boxes. I

It is a further object of my present invention to make use of a particular form of knockoff mechanism to effect resetting of the stopping mech'anismso that when the shipper handle is pulled on after stoppage all the parts of the mechanism are restored to normal position.

With these and other objects in view which will appear as the description proceeds, my

invention resides in the combination and. arrangement of parts hereinafter described and set forth in the claims. In the accompanying drawings, wherein a set forth, a I

I Fig. 1 is a top plan view of the front portion of a loom having my invention applied thereto,.parts beingfremoved for the sake of clearnes's,

'Fig] 2 is a verticalfs'ection on line 2 -2 of Fig. '1 looking in the direction of the arrows toward thestopping mechanism and the box end of the loom, i Z

p v p h convenient embodiment of my invention is Fig. 3 is a vertical section on line 33 of Fig. 2 looking in the direction of arrows 3,

Fig. 1 is a vertical section on line 44 of Fig. 2 looking in the direction of arrows 4:,

Fig. 5 is a horizontal section on line 5-5 of Fig. 2, certain parts of the construction being broken away to illustrate the structure more clearly,

Figs. 6 to 12 are diagrammatic views showing successive movements of certain elements of the mechanism,

Figs. 13 to 15 are diagrammatic views showing successive movements of the two parts of the mechanism which cooperate to stop the loom,

Fig. 16 is an end elevation taken in the direction of arrow 16, Fig. 1 on a reduced scale showing the shipping mechanism in normal running position, and

Fig. 17 is a detail view of a part of Fig. 2 showing the actuating dagger in a different position.

Referring, particularly to Figs. 1 and 16 Ihave shown a loom'side 20 and a lay 21. There is journaled'in the loom frame a shipper shaft 22 to which is secured a shipper handle 23; The shipper handle has a depending arm 24 which cooperates with the locking element 25 having a notched slot 26 to cooperate with a pin '27 on the arm 24.

Abrake release lever 28 is secured to a rolling rod 29 which is ournaled on the underside of the breast beam 30 of the loom and extends parallel to the lay. Said lever 28 has concave holding surfaces 31 and32 which are relatively far from and close to the axis of the rolling rod 29 and cooperate with a roll 33 carried on a rocking lever 34c loosely pivoted on the shipper shaft 22. A depending arin 35 on lever 34 is pivotally connected to a i'earwardly extending rod 36 which may passthrough a bearing 37 carried by the loom frame and have secured thereto a collar 38. A compression spring 39 lies between the bearing 37 and the collar 38 and tends normally to niove'the lever 34: in a clockwise direction around shaft 22.

Under "normal running conditions the parts will be in the position shown in Fig. 16 with the collar 38 spaced a slight distance -behind th'e arm 24 and with the roll cooperating with the surface" 31. Theshipper handle will beheld in'the forward running position as shown in Fig. 16 by the interengagement of the pin 27 and theii'otch 26.

At the time of loom stoppage from causes to be considered herein the rollingrod 29 will be'given a clockwise rotation as viewed in Fig.16 by a force derived from the lay, the effectof this movement beingi'to move the surface 31 out of engagement with roll 33' and permit the latter to move upwardly into the concave surface 32.1 This movement is caused by the compression "spring 39'and" is accompanied by engagement betweenthe ber 54,

formed in the bed 52 and is held in position the angular movement of rolling rod 29 that initiates the train of stopping operations just described.

' The left end of the lay as viewed in Fig. 1 is provided with upper and lower shuttle boxes 40 and 411, respectively, which cooperate with shuttles S and S, respectively, while the right end of the lay is provided with a single or plain box 13. By means of mechanism not shown but well understood the shuttle boxes will shift preferably every second heat of the lay, being held in the lowered position shown in Fig. 3'while the shuttle S is making two,

flights across the lay and then being moved upwardly so that shuttle S may make two flights across the lay. This alternation of the shuttles takes place every other pic-k when filling is-to be mixed. The box motion forms nopart of my present invention, but by its operation creates the conditions which must be met by the mechanism to be described hereinafter.

On the plan or right end of the lay as shown in Fig. 1 is located a feeler indicated general- I ly-at having aweft engaging member 51 which is slidably mounted on a bed 52 and ang'ularly movable about a stud 53 which extends upwardly from a slide or carrier mem- The latter moves in a groove 55 by the cap 56, said capand bed being. held by a bolt 57 to a platform or other support '58 fixed with respect to the loom.

-An indicating lever 59 is pivoted on a stud 60 preferably carried by the platform 58 and said lever has driving connection with a horizontally extending rod 61 which'may lie behind and parallel to the breast beam. A

forwardly extending tail 62 is formed as part of the weft engaging member 51 and is positioned for engagement withthe lever So long as sufficient weft is present in the shuttle on the right hand side of the loom the detector member 51 will slide forwardly with respect to the'bed 52 against the action of a compression spring 63 which is interposed between the member 51' and the bed 52. This movement carries the tail 62 forwardly without contact with the lever 59. When insufficient weft is present, however, the member 51 will slidealong the exhausted bobbin around stud 53 which will remain in rear position, this pivotal movement of the member 51 swinging thetail 62 to the left as viewed in Fig. l to rock the lever 59 about its axis and cause movement of the rod 61 to the left. 7

The weft. detector forms no part of my present invention and may be substantially the same as that shown in co-pending application Ser. No. 200,481 filed by Payne. Any other form of weft detector could be employed so long as it gives a longitudinal movement to the rod 61 at the time of indication of weft exhaustion.

My invention relates more particularly to the mechanism operatively interposed between the weft detector 50 and the rolling rod 29, and in carrying my invention into effect I secure to the shifting boxes a cam plate 7.0 which has upper and lower dwells.

71 and 72, respectively, and anintermediate high dwell portion 73. As shown in Fig-.3 said cam plate cooperates with a rod 7 4 movable in bearings 7 5 carried by the lay. Rod 74 is surrounded by a compression spring 7 6 whichbears against the right hand bearing 75 as shown in Fig. 3 and also against a cotter pin 77 on the rod 74, the effect of said spring being to hold the left hand endof the rod 74 in operative contact with oneor another of the faces of thecam member ,70. j

A bracket 80 secured to the layhas pivotally mountedthereon as at 81 sceFlgs. 2 and 3, a hooked lever82 having an. upstanding arm to cooperate with the rod 74 and having a depending arm provided with a hook 83. A compression spring .84 interposed between the bracket 80 and the depending arm of lever 82 tends to hold the latter in operative contact with the right handend of the rod 74.

It is to be understood that during a shifting of the boxes which takes place when the lay is in its forward position the rod 7 4 will be moved to the right to swing thelever 82 to the dotted lineposition shownin Fig. 3, spring 84 being effective to return the lever 82 to its normal position at the end of the shifting movement of the boxes.

Secured in the lower end of the bracket 80 is a stud 85 which has pivotally mounted thereon a three armed lever 86. The horizontal arm 87-which extends to the right as shown in Fig. 2 has secured thereto for angular adjustmenta clip 88 having a horizontal engaging end 89 which asshown in Fig. 3 normally overhangs the hook 83. A spring 90 surrounds a portion of the stud 85, one end of said spring passing through the stud as at 91 and the other end extending behind the second or depending arm 92 of the lever 86. The effect of said spring is to turn the lever 86 in a clockwise direction around the stud 85 as viewed in Fig. 2. Movement of the lever 86 under influence of the spring 90 is limited by an adjustable stop screw 93 supported by the bracket 80 and positioned for contact with positioned for engagementwith the shipper shaft 22. As thelay approaches its extreme forward position on each pick the screw 94 will engage the shipper rod 22 to cause rocking of the lever 86 in a"counter-clockwise direction as viewedin 'Fig2 around stud 85 against the action of spring 90. This causes downward movement of the third arm 95 formed on the lever 86 whichhas a dagger 96 adjustably secured therein byset screw 97.

In the operation of the mechanism thus far described, assuming thatthe shuttle is on the detector end of the loom so that the boxes will be at rest relatively to the layjas the latter moves'forwardly, thescrew 94 by engagement with theshipper rod 2 2-will cause such a rocki ing of lever 86 as will move the clip end 89 into holding engagement with respect to the hooked arm83. Inasmuch. asunder the conditions 'assumedthe rod'74 will-remain at rest, the lever 82will not rock and therefore as the lay moves re'arwardly the holding end 89 will be heldinrai'sed position by the hooked arm 83. The effect of this is to hold the dagger 96 in depressed position or in the position shown in 2..

On the next forward-inovementof the lay the shuttle will be at the box end of the loom and the boxes will shift so as tobring the rod 7 4 undercontrol of the dwell surface 78. Under these conditions the lever 82will be rocked to the dotted line position shown in Fig. 3 so that the hooked arm '88 will be out of, holding position relatively to the clip 88 and as the lay movesbackwardly a short distance such-as is sl' flicient to disengage the ,screw .94 from the shipper rod 22, said clip,

together with the lever 86,' will be moved aboutstud 85 by the sprin'g90 in a clockwise direction as viewed inFig. The effect of thls movement is toraise the dagger 96 into operative orknocking-ofi' position...

It'is to be understood that the contact hetween screw 94 and the shipper rod 22is only momentary and is of a shorter duration than is the contact between the rod 74 and the high dwell surface 73, so that the lever 8.6 maybe acted upon to move the dagger into operative position while the hooked arm 83v is still lzigld in nonsholding position by'the cam face On the following pick the bexeswill be at rest and lever 82 will therefore be in the full line position shown in Fig. 3. As the lay advanc esthe end 89 of the. clip willbe below the hooked end83of the lever as shown in Fig.17, and as screw 94 engages the shipper shaft 22 the lever .86 will be rocked to the left to, move the endY89 upwardly along'inelined surface 83. This causes rocking of lever .82-

against action of spring 8 1 and as the clip 88 rises the hooked end 83 will ultimately move under the clip to hold the lever 86 in the position shown in Fig. 2.

It will therefore be seen from the description given in connection with levers 82 and 86 that the dagger is in raised or operative position to knock-off the loom on alternate beats of the loom only, and is held down on the intervening picks, said dagger being re leased to move upwardly to knocking-off position when both shuttles are on the box end of the lay, so as to be in operative or knockofl position'on the next forward'beat of the lay, which of course will follow picking of the shuttle toward the single box.

I will now describe the mechanism which cooperates with the dagger 96 to effect the delay of at least four picks which is necessary between indication of weft exhaustion by the detector 50 and ultimate stopping of the loom. Secured to the rolling rod 29 as shown in Fig. 5 is a collar 100 held in any desired angular position by set screw 101. Said collar has slidably mounted therein a plunger 102, the head end of which as shown in Fig. 5 is urged in a direction parallel to the rolling rod by a compression spring 103 interposed between the head and collar. Stopping movement of the rolling rod is communicated to the latter through the plunger 102 by mechanism to be described.

A second collar 104 is secured to the rod 29 and acts to position a notched knockingoff member 105 freely rotatable on the rod 29 and located between the collars 100 and 104. One end of the notched member 105 is reduced as at 106 and has rotatably mounted thereon a shielding member 107 having a shield 108 disposed to the rear side of the rod 29. A counterweight 109 fast with the member 107 extends forwardly of the rod and acts to move the shield 108 upwardly when a lever 110 moves out of restraining contact with the shield. v

The lever 110, see Fig. 4, is pivoted to the breast beam as at 111 and is operatively connected to the rod 61, being moved from the full to the dotted line position shown in Fig. 4 out of restrainingposition relatively to the shield when the detector indicates weft exhaustion. Under normal conditions, however, when sufiicient weft is present, the lever 110 will engage the shield 108 to hold the latter in the normal position shown in Fig. 2.

The previously mentioned notched knocking-oft member 105 is provided with first and second notches 112. and 113, respectively, both of which are guarded by the shield 108 when the parts are in normal position. A fiat spring 114 may be secured to the member 105 and is adapted for engagement with the bottom of the breast beam during the latter part of the operation of thefstopping mechanism.

The member 105 is provided with notches 115 and 116, respectively, which are separated by a cam point 117, formed by inclined faces one of which extends toward each of the notches. Under normal conditions the plunger 102 occupies the notch 115 as shown in Figs. 5 and 15.

In the operation of the notched member 105 by the dagger 96 the parts will be in the full line position shown in Fig. 4. so long as sufficient weft is present. The dagger 96 when in lowered position will pass under the shield without contact-ing with the latter, and as shown in Fig. 2 the dagger will move beyond the shield to the position shown in said figure. On the beat-up of the lay following the pick of the loom when both shuttles are on the box end the dagger will be raised and will approach the shield 108, assuming the full line position shown diagrammatically in Fig. 7, but will be deflected by said shield to move downwardly to the dotted line position shown in said Fig. 7 to clear the lower or first notch 112. This operation continues so long as suflicient weft is presentin both shuttles.

When the detector 50 indicates weft exhaustion the shuttle will be on the plain end of the loom and therefore on the first beatup following indication the dagger 96 will" be in its depressed position as shown in Fig. 2. The detector moves the lever 110 to the dotted line position shown in Fig. 4, so that the shield 108 will be moved upwardly by the counterweight 109 to expose the first notch 112. The dagger, however, being normally down at this time moves under the notch 112 without engaging the same. Therefore, on the first beat-up of the lay after indication of weft exhaustion the parts will be in the position shown in Fig. 8, no movement having been made on the part of the notched member 105. c

On the second pick after indication when the shuttles are both in the box end the dagger will be raised and as the lay moves forwardly on the second beat-up after indication said dagger will engage the first notch 112 to rock the member 105 to the position shown diagrammatically in Fig. 9, said dagger being automatically disengaged from the notch and continuing to move to the left until it assumes the dotted line position shown in said Fig. 9. Remembering thatplunger 102 normally occupies notch 115 and referring to Fig. 5, it will be understood that this first angular movement on the part of the notched member 105 will result in moving notch 116 into holding position with respect to the plunger 102. That is, the parts move from the position shown diagrammatically in Fig. 13 to that shown in Fig. 1 1.

On the third beat-up of the lay the dagger 96 will again be in depressed position so that it will move from the full to the dotted line position shown diagrammatically in Fig. 10 without engaging the second notch 113.

On the next pick of the loom which immediately follows the third beat-up the shuttle which gave indication of weft exhaustion will be on the box end of the lay and will be picked across to the plain end. On the next or fourth beat-up of the lay the dagger 96 will be in its raised or operative position, having been released by the previous shifting of the boxes. On this fourth beat-up, therefore, dagger 96 will be able to enter notch 113'as shown diagrammatically in Fig. 11 to give the notched member 105 its second angular movement. The plunger 102, belng in notch 116, is caused to move with the member 105 as the latter has its second angularmovement and in so doing moves the collar 100 and also the rolling rod 29 in a clockwise direction as viewed in Fig. 16. Stopping of the loom therefore is initiated during the fourth forward stroke of the lay after indication of wet exhaustion with the plain end of row R as shown in the diagrammatic Fig. 12

and a resetting flat spring member 120 which is adjustably clamped to the shaft 22 by bolt 121 moves upwardly to engage the counterweight 109 to move the parts to the position shown in Fig. 12. The shield 108 is by this operation lowered to a position where the lever 110 may move back. by gravity to the normal or full line position shown in Fig. 4, thus effecting a resetting of said lever.

In actual practice I commence the stopping of the loom when the lay is approximately at its mid-position when moving forwardly or eariler or in the so-called bottom center position and stop the loom prior to the arrival of the lay at front center, the purpose being to prevent beating in of the pick of fillingwhich-has just been laid. If the device did not operate in this way the last pick laid by the exhausted shuttle would'be given a second beat to make a mark which would be visible in such delicate silk.

In restoring the notched member 105to its normal position relatively to the collar 100 I make use of a feature which is character istic of the form of stopping mechanism shown in Fig. 16. That part of brake release lever 28 which lies between the concave suris in this position the spring 114 will engage the bottom of the breast beam as shown diagrammatically in Fig. 11 to arrest further angular movement of the member 105.

collar 100 after the member 105 comes to rest fabrics as The rolling rod, however, which has connected thereto the collar 100 and theplunger 102,continues to move angularly under action of spring 39 until the roll 33 lies in the notch 32. This continued movement of the ,7 moves the plunger 102 from notch 116 as shown diagrammatically in Fig. 1e back to notch 115 to the position shown in Fig. 15. The inclined faces which define the cam (5 point 117 act to cooperate with the plunger to move the notched member 105 to the final position when said point 117 passes the plunger when going in either direction, so

that it is not necessary that the whole relaeiii tive motion between the member 105 and 001- lar be caused by positive movements. By the stopping of the loom the notched member is restored to its normal position relatively to the collar 100 and on. a subsequent starting up of the loom after the de pleted shuttlehas been replenished byhand the notched member will be moved in a counter-clockwise direction as viewed in Fig. 16 when the weaver pulls forwardly on lever -f, 28 to release the brake. The notches 112 and 113 are in this way restored to a position where they will be covered by shield 108.

From the foregoing it will be seen that I have provided means dependent upon shiftg ing of the shuttle boxes to effect loom stoppage a plurality of pairs of picks after stopplng is initiated by the, weft detector. It will also be seen that two successive box shifts are necessary to complete thefstopping initiated by the detector, each shift of the boxes accounting for a delay of two picks, thus providing for a total delay of at least four picks between initiation and completion of loom stoppage. I 1

It will further be seen that I have provided a mechanism wherein the actuator or the dagger 96 is in operative position with respect to the member 105 only on alternate beats and that two angular movements infiw the same direction on the part of notched member 105 caused by the dagger are neces sary before stopping is effective. It will further be seen that it is not until the second, forward movement of the dagger after indication that the first angularrmovementof the member 105 occurs. due to the fact that the dagger depressed on the first forward movement of the lay because of the fact that the shuttle is at the plain end of the lav. It 120 Will also seen that the notched member is reset to its normal position angularly with respect to the rolling rod during the last part of the stopping movement of said rolllng rod, so that manual setting on the part" of the operator is rendered unnecessary. Also, the shipper handle is effective through the member 120 to restore the shield to normal shielding be'seen that the stopping is '130 efl'ected'by two stages which occur two picks apart, the first stage taking place on the sec 0nd of the first pair of picks following indication of weft exhaustion.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a loom, shifting shuttle boxes to operate with a plurality of shuttles any one of which may become active, weft detecting mechanism, loom stopping mechanism, and a train of devices to delay the operation of the stopping mechanism interposed mechanically between said mechanisms and operative only upon a shifting of the shuttle boxes to complete a stopping of the loom which is initiated by the weft replenishing mechanism.

2. In a loom, shifting shuttle boxes to operate with a plurality of shuttles any one of which may become active, a weft detector, stopping mechanism for the loom, and means to delay the operation of the stopping mechanism interposed mechanically between the detector and mechanism and controlled by and dependent for its operation upon a shifting of the shuttle boxes to stop the loom when substantial exhaustion of weft is indicated by the detector.

3. In a loom, shifting shuttle boxes to operate with a plurality of shuttles any one of which may become active, a weft detector to initiate stopping of the loom at substantial exhaustion of weft, loom stopping mechanism, and means to delay the operation of the stopping mechanism operatively related to the shifting boxes and the stopping mechanism and dependent upon a shifting of the shuttle boxes to complete a stopping of the loom which is initiated by the weft detector only after shifting of the boxes.

4.111 a loom stopping mechanism to stop the loom prior to complete exhaustion of weft in the running shuttle, two shuttles which are operative in alternation, each shuttle to be active for two picks only at a time, a lay to move forwardly after each flight of a shuttle, an actuator carried by the lay, control means to move said actuator to operative position on every alternate beat of a loom only and to hold said actuator in inactive position on the intervening picks, knock-off means to be given two successive movements one at a time by the actuator when the latter is in operative position only, said actuator giving the means one movement on one forward stroke of the lay and the other movement on the second stroke of the lay thereafter, and mechanism controlled by the knock-off means effective to stop the loom as said means is given its second movement.

5. In a loom stopping mechanism to stop the loom prior to complete exhaustion of weft in the running shuttle, two shuttles which are operative in alternation, each shuttle to be active for two picks only at a time, a lay to move forwardly after each flight of a shuttle, two elements adapted for cooperation one of which is movable by the other as the lay moves forwardly, weft detecting mechanism to indicate substantial weft exhaustion, means to hold said elements out of cooperative relationship on alternate forward beats of the lay after indication of weft exhaustion, and means'to stop the loom upon the second cooperation of said elements.

6. In a loom stopping mechanism to stop the loom prior to complete exhaustion of weft in the running shuttle, two shuttles which are operative in alternation, each shuttle to be active for two picks only at a time, a lay to move forwardly after each flight of a shuttle, a weft detector to detect the condition of weft in the running shuttle, a stopping element mounted on the loom, an actuating element mounted on the lay, means normally shielding the element on the loom from operative connection with the element on the lay, said means being moved out of shielding position by the weft detector at substantial exhaustion of weft in the running shuttle, means to move the element on the lay to operative position relatively to the element on the loom on alternate beats only of the lay, and mechanism operative upon a second cooperation of said elements after indication of weft exhaustion to stop the loom, whereby four picks lapse between indication of weft exhaustion and stopping of the loom.

7. I11 mechanism to stop a loom prior to complete exhaustion of weft in the running shuttle, two shuttles which are operative in alternation, each shuttle to be active for two picks only at a time, a lay to move forwardly after each flight of a shuttle, two' shifting 1 shuttle boxes on one end and a plain box on the condition of weft in the active shuttle when the latter is in the plain box, and means to stop the loom on the fourth pick following indication of exhaustion with the shuttle in the boxat the plain end of the lay, said means including two trains of mechanism, each train acting to delay stopping two picks after indication of weft exhaustion.

8. In mechanism to stop a loom prior to complete exhaustion of weft in the running shuttle, two shuttles which are operative in alternation, each shuttle to be active'for two picks, only at a time, a lay to move forwardly after each flight of a shuttle, two shifting shuttle boxes on-one end and a plainbox on the other end of the lay, a weft detector adjacent the plain box end of'the lay to detect the condition of weft in the active shuttle ternate beats-only of the lay and two cooperations being required to effect stopping of the loom.

9. In mechanism tostop a loom prior to complete exhaustion of weft in the running shuttle, two shuttles which are operative in alternation, each shuttle to'be active for two picks only at a time, a lay to move forwardly after each flight ofa shuttle, two shifting shuttle boxes on one end and a plain box on the other end of the lay, a weft detector adjacent the plain box end of the lay to detect the'condition of weft in'the active shuttle when the latter is in the plain box, and means to stop the loom-on the fourth pick following indication of exhaustion with the shuttle in the box at the plain end of the lay, said means including two trains of mechanism which are operatively related to each other after indication of weft exhaustion on the two alternate beats of the lay following india cation of weft exhaustion.

10. In a loom having two shifting shuttle boxes and two shuttles which are operative in alternation, each shuttle for a given number of picks at a time, a weft detector, a stopping mechanism, two devices to cooperate to effect loom stoppage, each device normally incapable of cooperating with the other, the detector to render one device capable of cooperating with the other upon indication of Weft depletion, and means actuated by and dependent upon a shiftin of the shuttle boxes to render the other evice capable of operation, said devices cooperating to stop the loom.

11. In a loom having two shifting shuttle boxes and two shuttles which are operative in alternation, each shuttle for an even number of picks at a time, a weft detector, a stopping mechanism, two devices to cooperateto .eifect'loom stoppage, each device normallyincapable of cooperating with the other, the detector to render one device capable of cooperating with the other upon indication of weft depletion, and means actuated by and dependent upon a shifting of the shuttle boxes to render the other device capable of operation, said devices cooperating to stop the loom an even number of picks after indication of weft depletion.

12. In a loom having two shifting shuttle boxes and two shuttles which are operative in alternation, each shuttle for an even number of picks at a time, a weft detector, a

stopping mechanism, two devices to cooperate to effect loom stoppage, each device normally incapable of cooperating with the other, the detector to renderone device capable of cooperating with the otherupon indication of Weft depletion, and means actuated by and dependent upon a shifting of the shuttle boxes to render the other device capable of operation, said devices cooperating to stop the loom an even number of picks after the detector acts .on the device cooper- I atingtherewith. i e 13. In a loom havingshifting shuttle boxes, each shuttle box to be in active position a-givennumberof picks, a weft detector, loom stopping mechanism to delay the operation of the stopping mechanism, a'train of mechanism between the detector and stoppingmechanism and normally out of controlling relation with respect to the stopping mechanism, said train including a normally inoperative part actuated by the de- 7 tector and movable thereby at weft depletion to operative position, said train including also a device requiringa number of picks to complete its cycle of operation equal to the number of. picksduringwhich any one of the shuttle boxes is in active position, said devicefto be 'controlled by'the shifting of the shuttlebox and to cooperate with the said part and 'operativelyconnected to the stopping mechanism to stop the loom, said train elfected to stop the loom a number of picks which is double the number required for the-operation of said device.

14:.In a; 'loomj having shifting shuttle boxes, each shuttle box to be in active position a givennum'ber of picks, a weft detector, loom stopping mechanism, a train of mechanism to delay the operation of the stopping mechanism between the detector and stopping mechanism and normally out of controlling relation with respect to the stopping mechanism, said train including a normally inoperative partactuated by the dete ctorand movable therebynat weft depletion to operative position, said train including also a device requiring 'a number of picks the number of picks during which any one of the shuttle boxesis' in active position, said device tobe controlled bythe shifting ofthe shuttle box and to cooperate with "the said part and operatively connected to the-stop ping mechanism to stop the loom, said train effected to stop'the loom" a number ofpi'c'ks whichis double the number during which any one shuttle-box isinjactive position, i

y 151 In aloom having shifting shuttlejbo xes to ope'ratew'ith a plurality of shuttles any one of which may become active, a weft detector' to cooperate with the; active shuttle, and a loom stopping mechanism under the joint control of the shuttle'boxes and the detectorand dependent upon both a shifting of the shuttle boxesandan indicating move ment of the detector to have a loom stopping movement. e I

16. In a loom having shifting shuttle boxes to operate with a plurality of shuttles any one of which may become active,,a weft detector to cooperate with the active shuttle, a loom stopping mechanism, a progressively movable controller for the stopping mechanism, interposed operatively between the latter and the detector, a knockoff element to cooperate with the controller, and operative connections between the shuttle boxes and element to prevent coaction between the controller and element until'the shuttle boxes have shifted subsequent to an indication by the detector.

17. In a loom having shifting shuttle boxes to operate with a plurality of shuttles any,

one of which may become active, a weft detector to cooperate with the active shuttle, and stopping mechanism effective to stop the loom and under the joint control of the detector and shuttle boxes and dependent upon both an indicating movement of the detector and a subsequent shifting of the shuttle boxes in order to effect stopping of the loom.

18. In a loom having shifting shuttle boxes to operate with a plurality of shuttles any one of which may become active, a weft detector to cooperate with the active shuttle,

loom stopplng means, and a controller mechanism for the stoppingmeans normally rendering the latter inoperative and having a series of progressive movements to render said stopping means operative, said controller mechanism being under the joint control of the detector and shuttle boxes and dependent upon an indicating movement of the detector and a subsequent shifting of the shuttle boxes before rendering said stopping means operative.

19. In a loom having shifting shuttle boxes I to operate with a plurality of shuttles any one of which may become active, a weft detector to cooperate with the active shuttle, a knock-off device. having aregular move- ,ment and capable of stopping the loom, a controller mechanism normally effective to render said knock-off device ineffective to stop the loom and movable to a position to render said knock-off device effective to stop the loom, said controller mechanism being interposed operatively between the knockoff device and the detector and being under the joint control of the detector and shifting boxes and dependent upon an indicating ter after an indication of weft exhaustion by the detector, said means including apart .to

be moved by the shuttle boxes as they shift, the stopping mechanism being dependent upon movement of said part by the shuttle boxes to effect loom stoppage.

In testimony whereof I'have hereunto afiixed my signature. i 1 4 VICTOR H. JENNINGS.

movementof the detector and a subsequent I shifting of the shuttle boxesprior to movement to a position to render saidkno'ck-off deviceeifective to stop the loom.

20. In a loom, shifting shuttle boxes, a

detector to indicate substantial exhaustion of weft in the active shuttle, loom stopping mechanism, and control means for the stopping mechanism operatively interposed be- 

